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Sunny and very warm
Some rain and a thunderstorm
Clouds limiting sunshine
of sunlight, then sets at
of moolight, then sets at
After a brief cooldown, very warm and humid weather will bounce back in Philadelphia in time for the Labor Day weekend. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.